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-rw-r--r--Lib/unittest/case.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index c3634ec..402fa47 100644
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -509,7 +509,7 @@ class TestCase(object):
case as failed but resumes execution at the end of the enclosed
block, allowing further test code to be executed.
"""
- if not self._outcome.result_supports_subtests:
+ if self._outcome is None or not self._outcome.result_supports_subtests:
yield
return
parent = self._subtest